Jack for automobiles.



* i* A. 1. MICHELIN.

W MCK FOR AUTOMOBILES, APPLICATION FILE DECv.27, l917..

Y Patentedrmg. '13, 1918.-

lll

,UNITED STATES. iAperitivi;L OFFICE.

ANDRJULES MICHELIN, or PARIS, FRANCE, AssIGNonro MICHELIN a CIE., or CLERMONT-FERRAND, FRANCE, a .CORPORATION or FRANCE,

JACK FCR AuToMoBILEs.

To all whom z' may Concern.' 113e 1t known that LANDR lULns MICHELIN,

a citizen of the lFrench lRepublic, residing at Paris, France, have invented certain new andusetul Improvements in lJacks for Automobiles; and I do hereby declare the following to be a full, clear, and exact descrip- 'l tion of the'invention, such as willr enableothers skilled in the art to which it appertains .to-,make and use the same.

My invention relates to llnprovements 1n lifting jacks, and especially in lifting jacks adapted to be Aused with automobiles where it'ls desired to Secure a light, compact and eflicient structure thatimay be conveniently carried" asv a part of the equipment ofthe may be'kept well` lubricated. A y invention' will be more [fully understood after reference to the accompanying p drawlng, in which Q Figure l 1s a sideV elevation of the Jack showing the head partly raised from" the casing.

Fig. 2 is-a pla-n view of the jack shown in Fig. l.

along the line 3-3 of Fig. 2, and looking in the direction ofthe arrows; and

, bearing for use lin the ack.

The parts are contained in a easing which consists. of a basefplate 1, preferably vribbed or rough/cned .atthe bottom' so as4 not to slip on the ground, and av h ollow `housing 2,

which is flanged at the bottom` and is pvsecured at the'platel by suitable-bolts o.

This hou'sing 2 is 'preferably tapered in vthe form 'of a truncated cone-at its lower end, and its upper endi is cylindrical, as

sh'ownfat 2a, and is provided with' 'ajcylin ',drical bore to form a bearing for the' tube and the upper nut, .as will be hereinafter de. scribed.

is a screw having its bottom V"pgtnrtion made angular, as at Sito engagein the center of lthe gearwheel il, which issupported on suit- Aillleanti-friction thrustbearings, such, for

Specification of Letters Patent. Application filed December 27,1911?. Serial N o. 269,092.

which .is splined z as at 12, to engage thejspline' 13, and thus tube to move ina vertical material.

:Patented Aug. 13, 191s.

instance, as the rings' and 6 and the inter-4 posed balls 7.v The gear wheel isrotated by means vof the pinion 8 whose stemal isy jour naled in the bearing 2, andis provided with a socket 8* for the operating tool, not shown. The stem is held in placein its bearing by means of the lock ring 9. i p

10 represents a nut lwhich engages the screw threads on the screw 3, and is moved up or down as said screw is rotated; the ro-` tation of the screw being eiiected by the pinion 8 andgear wheel 4', already referred to. Secured to this nut 10 and abutting against the shoulder 10a of said nut is the tube 11,

along an element thereof,-

to cause the said direction but without turning. This tube :carries `at its upperendthe nut 14, having a.

coarseinternal screw thread, and having a shoulder llengaging the upper end of the tube' llg'thefsaid nut lllbeing rigidly vseany convenient Sway,V

cured tothe tube 11 in as by means of the set'screws 15.

Passing through ,thel upper nut 14 is the lengthening,memberl 16, in 'the form of a hollow screw, having coarse screw threads f v 4 L to enga-ge with the .screw threads of thefnut Fig. 3: shows4 acentral vertical sectionl `for the-head 3b of the screwv v3, when the lengthening member is in the lowered position shown in Fig.- Secured tov the end of thislengtliening member 16 `is the jackrllhe 4lengthenin'g member `16 is preferably perforated,- as tt-16, to permit the insertion y of lubricant into the interior .of the -tube 11, sothat-'it will keep the v'inclosed screw 3 well lubricated.

'To-secure .the bestresults, the 10 and i 14 should preferably be made Mot" bronzeyor other metal having a small eoetficient of friction with steel, and the ','screw 3'and 'lengthening member 16 should Ipreferably be made of steel, asl also the gearwheelLl-I and pinion 8. y .The housing 2 and plate 1 may be made of .cast steel 'or'.fnaalleableiron, or any suitable gage the ball may - 3. Then in this position the parts of the- Inthe form of device shown in Fig. 4, instead of hav-ing a ball race, as shown in Fig. 2, a single ball and socket bearing is provided, in which 3 represents the lifting screw whose lower end is fast to the block 6a secured to the gear wheel "i, block 6a .is provided with a' socket 6b to'en- 7a. This ball rests in a socket 5c 'in the ordinary metal bearing 5a screwed into the plate 1, as at 5".

In `either cpnstruction, I provide an antifriction thrust bearing for the gear wheel 4 and screw 3 secured thereto.-

The operationof the device is as follows:

vWhen out of use the parts will be in the position shown in Fig. 3, now if it is desired to lift one end of the axle of an automobile, or other wheeledl vehicle, turn the jack head 17 by hand, causing the coarse screw threads on the extension piece 16 to permit the quick extension of the jack head 17 until the .j ack head bears on the bottom of the axle to be lifted; now insert the operating tool, such as an ordinary hand crank, or a ratchet and pawl and lever arrangement, in the socket 8b, and turn the pinion 8 in the proper direction to cause the screw 3 to lift the nut 10 and the parts supported thereby.

It will be seen that quick extension of the jack may be secured and then the slow movement under power is applied.

It will be noted that the head ofthe jack be lifted almost thefull length of the screw 3,-plus Ithe distance between the shoulder 16 andthe lower face of the nut 14, when the parts are in the position shown in Fig. 3. This will be the maximum throw of the jack.

After the jack is extended, in order to restore the parts to the initial. position,turn the pinion 8in the reverse direction so as to bring the nut 10 downto its bearing on the top of the gear wheel 4, andthen turn the head of the jack until the-lengthening member assumes the position shown in Fig.

jack arein extremely compact form and may be very conveniently stored away in the tool box of the automobile.

It will be noted that the screw 3 and nut 10 willi be protected from dust and other foreign matter, and may be readily lubricated through the opening 16C, which open? ing may be closed if desired with any suit'- able removable plug. Furthermore, when the lengthening piece is brough-t to its most f extended position its screw threads may be conveniently cleaned and lubricated, while these threads, as alsothe threads of the nut 14, are normally protected against dust, when the jack is in the closed position, by the headtof the jack, as shown in Fig.v 3.

It will be obvious that various modifications might be madein the herein described apparatus, and inthe construction, coinbiand this nation and arrangement of parts which could be used without departing from the spirit of my invention, and I do not mean to limit the inventionto such details exceptv as specifically pointed out in the claims.

Having thus described my invention what I claim and desire to secure by Letters Pat.- tent of the United States is 1. A lifting jack comprising a substantially dust 4tight casing, a lifting screw journaled iirsaid easing, vgearing operable from the exterior of said casing for turning said screw, a lower' nut mounted upon said screw, a tube fast to said lower nut and vertically movable'in said casing, an upper nutfast to said tube, a lengthening member' in the form of a hollow screw mounted over said lifting screwand engaging said upper nut, and ahead carried by said lengthening member, substantially as described.

2. A lifting jack comprising a substan' tially dust tight casing, a -lifting screw` journaled in said casing, gearing operable from the exterior of said casing for turning said screw, a lower nut mounted upon said screw, a tube fast to said lower nut and vertically movable in said casing, an upper nutfast to said tube, a lengthening member in the form of a hollow screw mounted oversaid lift-ing screw and engaging said upper nut,

anti-friction thrust bearings mounted in said casing and supporting said screw, and a head carried Aby said lengthening member, substantially as described.

3. A 'lifting jack comprising a substantially dust tight casing, a lifting screw journaled in said casing, gearing operable from the exterior of said casing for turning said screw, comprising a pinion shaft projecting through said casing, a pinion driven .thereby, a gear wheel driven by said pinion, and a lower nut mounted over said screw and 'fast to said gear wheel', a tube fast to said llower nut and vertically movable in said casing, an upper nut fast to said tube. a lengthening member in the form of a hollow 'screw mounted over said lifting screw and engaging` said upper nut, and a head carried by said lenothening member, substantially as describe 4. A lifting jack comprising a substantially dust tight casing, a.lifting screw journaled in said casing, gearing operable from the vexterior ofsaid casing for turning said screw, comprising apinionshaft projecting through said casing, a pinion driven and fast to saidfgear wheel, a tube fast to said lower nut and vertically movable in said casing, anupper nut fast to Asaid tube, a lengthening member in the form of a hollow screw mounted over said lifting screw and engaging said upper nut, anti-friction thrust bearings mounted in said casing and thereby, a gear wheel driven by said pinion, vand a lower nut mounted over said screw isb supporting said Screw, and a head carried by Said lengthening member, substantially as described. e i

5. A lifting` jack leon'iprising a substantially dust tight Casing, a lifting screw journalecl insaicl easing, gearing operable from Jche exterior of said easing forturni-ng Said screw, a lower nui: mounted upon said serew,

a tube fastfto said lower nut and vertically 10 movable in said casing, an nppernut having coarse internal screw threads relative te lie threads on'said lifting screw sind fast tosaid tube, a lengthening member in the form of a hollow screw mounted over 'said lifting screw" and engaging said upper nut, and a head carried by4 said lengthening member,

Snbstantially -as described. n

ln testimony whereof, I aliix my signe- ANDR 'JULES Meeneme- 

